METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK AND METHOD FOR MANUFACTURING MAGNETIC DISK

WIPO Patent Application WO/2015/072569

A1

A method for manufacturing a glass substrate for a magnetic disk comprises polishing treatment for pressing main surfaces on both sides of a glass substrate by polishing pads, and relatively moving the main surfaces and the polishing pads while supplying polishing slurry containing colloidal silica as polishing abrasive grains between the glass substrate and the polishing pads to thereby polish the main surfaces. The polishing slurry is produced by adjusting original polishing slurry that is a starting material of the polishing slurry used in the polishing treatment to an acid state, and further filtering and removing silica precipitates in the original polishing slurry, which have been produced by the adjustment to the acid state.

JPS6057131	[Title of the Invention] A manufacturing process of a high storage density magnetic disk
JP2015066521	CLEANING METHOD, CLEANING DEVICE, MANUFACTURING METHOD OF GLASS SUBSTRATE FOR MAGNETIC DISC AND MANUFACTURING METHOD OF MAGNETIC DISC
JP2621929	INDUSTRIAL APPLICABILITY: Method for forming a protective film containing a polymer fluoride

SAKAI HIDEO (VN)

PCT/JP2014/080373

May 21, 2015

November 17, 2014

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HOYA CORP (JP)

G11B5/84; B24B37/00; B24B57/02; C03C19/00; C09K3/14

JP2013152775A	2013-08-08
JP2012143823A	2012-08-02
JP2010519157A	2010-06-03
JP2013091589A	2013-05-16

GLOBAL IP TOKYO (JP)
Global IP Tokyo patent business corporation (JP)

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